Excavator



A. ORLOFF June 30, 1931.

EXCAVATOR Filed March 25, 1928 f A TTORNEYS Patented June 30, 1931 UNITED STATES PATENT- OFFICE ARTHUR ORLOFF, OF GREEN BAY, .WISCONSIN, ASSIG-NOR TO NOR'II-IXVEST ENGINEER- ING CORPORATION, OF GREEN BAY, WISCONSIN,

A CORPORATION OF WISCONSIN I nxonva'ron Application filed March 2a, 1928; Serial No. 264,260.

The invention relates to excavators, and more particularly to excavators of the type in which the dipper or bucket travels along .guideways provided on a boom.

The object of the invention is to provide a rope or cable drive for the bucket to positively move the same in or out along the boom, the drive being provided by a novel arrangement and reeving of the rope or cable for hoisting the boom.

The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings Fig. 1 is an elevation 1 view of an excavator embodying the invention; I

Fig. 2 is a plan view thereof, parts being broken away. y In the drawings the numeral 3 designates the body of the excavator, usually embodying a travelling base 4, here shown as equipped withendless treads 5 adapted to be connected up to any suitable source of 5 power, and 6 the rotating base on which the power plant or prime mover is generally mounted. The boom 7 is here shown associated with the rotating base and is mounted for up and down movements relative there to, or the boom itself may be; associated with a rotatable mast on a non-rotating base, as will be readily understood by those familiar with this art, it being noted that in either case the boom is mounted to swing relative to the travelling base and to move down and up for digging or discharging its load.

in the present instance a frame member 8, which does not form the subject matter of the present invention, hinged to the rotating base and secured in adjusted position relative thereto by a cable 8, forms an eX- tension of the main base 6 and carries the boom pivot-pin 9.

A'shaft 10 is journalled in suitable supports on the base 6 and has a hoisting drum 11 and a dragline drum 12 mounted thereon. Each of these drums is equipped inknown manner with a clutch for connecting it to shaft 1.0 and a brakev for stopping its rota tion and the numeral 13 designates a clutch all) and 1a a brake for. drum while the nu.- meral 15 designates aclutch for the drum 12 and 16abraliefor said dru m.. The shaft 10 is driven in any suitable manner fromthe prime mover (not shown) as by a. gear 17 on said shaft-meshing with a pinion '18 on a shaft 19- adapted to be connected by'any suitable transmission mechanism with "said prime mover, such as an electric motor, in-' ternalcombustion engine or steam engine.

According to" the present invention the hoisting line 20 associated with drum 11 passes therefrom over a sh ea .ve21-, thence over a, sheave 22 supportedflby strutsw23' atthe outer end "of the boom, u thence rearwardly' over a sheave 24:.mounted on the boom pivot-" pin '9 and thence to. a dead end connection 25 with the dipper26 whose carriage 27 is providedlwith rollers 2$ mounted to run trackways 29 provided on both sides of the boom. i l

The construction of the dipper is not shown in detail but it is of known form, having a droploottom for dumping its load and suit able latch mechanismfor holding said bottom closed during'di'gging and releasing the same when the dipper is in position for discharging'its lo-ad, 7

Thedragline 30 associated with the drum 12. passes therefrom outwardly to and over a. sheave Slfiatfith'efloutr end of the boom and thence tothedipper 26. where it is dead ended as at32".

i 1 In'coperation, it is. merely necessary, in order to retract the dipper, to wind in on hoisting line 20,, thusapplying a tension at therear end of the dipper, drawing it to ward" the machine. When it is desired to em ploy line 20 for the purpose of hoisting the boom, it is only necessary to wind in on said line, but retraction of the dipper may be prevented by applying thebrake16 on the drum 12, thus. preventing the dragline .30 from being payed out and permitting the cle vation of the boom to proceed without necessarily altering the position of the dipper lengthwise of the boom. For digging, the

dragline, 30 is tensioned by winding it up on its drum 12, causing the dipper to move outwardly nto the material while the hoisting line 20 is payed out from the then loose drum 11 under the control of the brake 14.

I desire it to be understood that this invention is not to be limited to any particular form or arrangementof parts except insofar as such limitations are included in the claims or necessitated by the prior art.

What I claim as my invention is:

1. In an excavator, the combination with a boom mounted for up and down and lateral swinging movements, of a dipper mounted to travel back and forth along the boom, a cable operatively connected with the boom at a point forward of its mounting and at a point adjacent its mounting and then with the dipper for raising and lowering the boom and retracting the dipper, a cable for moving the dipper outwardly during digging, and means for controlling said cables including a brake to restrain the movement of said last named cable while raising the boom by first named cable.

2. In an excavator, the combination with a supporting platform, of a hoisting drum mounted thereon, a boom connected with said platform for up and down movements, a dipper mounted to travel back and forth along the boom, a cable. on said hoisting drum operatively connected with the forward and rear portions of said boom and secured to said dipper for retracting the same, a second drum, and a cable on said second drum associated with the forward end of the boom and with said dipper for moving it outwardly during digging and means for controlling said drums including a brake for said second drum to restrain the movement of said last named cable While raising the boom by said first named cable.

3. In an excavator, the combination with a boom mounted for up and down movements, of a dipper mounted to travel back and forth along the boom, a cable connected with the boom at points forward and adjacent its mounting and then with the dipper for raising andlowering the boom and retracting the dipper, a cable for moving the dipper outwardly during digging, drums for said cables, and separate controls for said drums including a brake for one of said drums to restrain the movement of said last named cable while raising the boom by said first named cable.

.1. In an excavator, the combination with a boom mounted for up and down and lateral swinging movement, of a dipper mounted to travel back and forth along the boom, a cable connected with the forward and rear portions of the boom and then with the dipper for raisingand lowering the boom and retracting the dipper, a cable for moving the dipper outwardly during digging, a powerdriven shaft, drums for said cables mounted on said shaft, and clutches and brakes for controlling said drums the brake for the drum of the second named cable restraining the movement of said cable while raising the boom by said first named cable.

In testimony whereof, I afiiX my signature.

ARTHUR ORLOFF. 

